Gage Bias

Also known as Accuracy, Bias is an estimate of the error in the measurement system. Bias is estimated by taking repeat samples of a part or standard using the measurement system, and comparing the average of these measurements with a measurement taken of the same piece using equipment with higher accuracy.

BIAS = Average of Measurements – Reference Value

% Bias = (Bias / Process Variation) * 100%

PV is the Process Variation, which may be estimated as 6 times the Process Sigma value calculated from a control chart.

Learn more about the Quality Improvement principles and tools for process excellence in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, or his online Green Belt certification course ($499).